Improvement in elevators for buildings



S. H. BEVINS & LWEIS. mm/"Mons FOR BUILDINGS.

' Patented J'an.4,1876.

PETERS, PHOITQ-LITHOGRAPHER WASHINGTON. D. C.

UNITED STATES PATENT OFFICE.

SETH H. BEVINS, OF NEW YORK, N. Y., AND JOSEPH WEIS, OF JERSEY CITY, NEW JERSEY. v

IMPROVEMENT IN ELEVATORS FO R BUILDINGS.

Specification forming part of Letters Patent No. 1 71,716, dated January 4, 1876; application filed November 15, 1875.

To all whom it may concern:

have been retained out of action by the hoist-,.

ing-rope, and operated automatically in cases where the rope breaks.

Our present invention consists in a centrifugal hammer that, at ordinary speed, is inoperative, but which comes into action centrifugally when the speed increases and knocks aside a trip and brings into action the locking mechanism, so that when the car is in motion at ordinary speed the locking mechanism is unacted upon, but the moment the speed increases, as it does the instant the car commences to fall, the hammer knocks away the device that has kept the locking-pawls out of use, and they are liberated and hold the car. By employing this independent regulating device, the risk of accident is greatly lessened, because the safety appliance is brought into action when the maximum speed is increased from the slipping or breaking of a belt, or from any cause.

In the drawing, Figure lis a vertical section of the elevator, Fig. 2 is a plan of the centrifugal hammer and trip, and Fig. 3 is an inverted plan of the platform of the elevator.

The platform or car a, with its frame b, are moved up and down in the slides c by any suitable means. Upon'the faces of the slides c are the racks d, and .c e are sliding pawls upon the under side of the platform,that are forced outwardly into the rack-teeth by the springs f whenever the said pawls e c are disengaged from the device that retains them in their retracted position." We prefer and use the jaw g upon theshaft h for retaining these spring-pawls. The arms 41 of the pawls e are received within the jaw y when the pawls are Withdrawn by the levers 7a or otherwise, and when the shaft his partially turned the jaw swings away from these arms, and liberates them and the pawls. The shaft h is in bearings upon the platform, preferably at the un der side, and at the end of the shaft h a leverarm, I, is attached, and connected with the endless rope or chain m, as shown in Fig. 4, that passes around the pulleys an at top and bottom of the elevator-well; and we remark that the trip and its mechanism may be applied at the top of the elevator-space, or at the bottom. We have shown itat the top. The pulleys or wheels an, over whichthe rope or chain m passes, allow a portion of such rope to pass horizontally aroundthe pulley r upon the vertical shaft 8, upon which thecentrifugal hammer t is applied, the handle of the same being connected to s by the hinge at 2, so thatit may swing out more or less, according to the speed and centrifugal force. The

brake-lever v is pivoted at 3 and weighted at v 4, and in the normal condition it is held up out of the way by the blocking-arm w upon, a shaft, 5, that is provided with a tripping-lever,

w. The parts are so constructed and posited that at ordinary speeds the centrifugal hammer t revolves near to but does not touch the trip-lever w, and the friction of the jaw 9 that holds the locking-bolts is sufficient to cause the movement of the chain or rope and of the centrifugal hammer as the car or platform is moved up or down; but as soon as the speed of the hammer t is accelerated by the fall of the car, or its downward movement at a speed in excess of the maximum velocity, the hammer flies out, knocks away the trip, the brakelever falls, its brake-block 7 catches and holds the rope or chain m, and the further movement of the platform causes the lever Z to swing the jaws g away from the locking-bolts e, and they are liberated and hold the car by the racks d. This movement is more direct and rapid than the movements that depend upon governor-balls that rise gradually, and in so doing influence the brake mechanism as heretofore employed.

It will be apparent that if the revolving hammer and brake mechanism are upon the car, and one portion of the rope that runs over stationary pulleys at top and bottom of the elevator-well is attached to the lever l, as aforesaid, and the other portion runs around the pulley of the centrifugal hammer, the brake mechanism will be as efficient in holding the rope and causing the descent of the car to liberate the locking mechanism, as in the position shown. The revolving hammer might act directly upon the mechanism that holds back the locking mechanism, so as to liberate the same, but we prefer to use the devices shown.

We claim as our invention- 1. The combination, with an elevator platform or car, and the locking pawls or bolts thereof, of mechanism to hold such locking device out of action, and a revolving hammer to liberate the locking mechanism when the maximum speed of such revolving hammer is exceeded, substantially as set forth.

2.The revolving centrifugalhammer and trip mechanism, in combination with the brake and rope or chain, and the mechanism for holding the locking bolts or pawls out of action, substantially as set forth.

3. The automatic locking-bolts e, placed beneath the platform, in combination with the jaw g, shaft h, and lever l, for holding or libcrating such bolts, substantially as specified. 1

4. The rope or chainm, attached to the leit ism for liberating the automatic lockingbolts i e, substantially as specified.

Signed by us this 3d day of November, A. a

SETH H.,BEVINS. JOSEPH WEIS.

Witnesses:

GEo. T. PINCKNEY, CHAS. H. SMITH. 

